Gareth Malone launches his exciting singing contest to find Britain's most entertaining amateur choir.This week, Gareth is looking for a choir to represent Scotland and the north of England, in a tour that takes him from the rugged beauty of the Scottish Highlands to the rolling hills of the Peak District. From the hundreds who applied, the groups Gareth has chosen to audition include a cancer care choir from Manchester, a troupe of singing mums in Durham, a bluff bunch of Yorkshire pensioners and some soulful singers in Edinburgh. All are hoping to secure a place in a sing-off that could put them through to the national stages of the contest, but who will Gareth choose? And will his expert advice and tuition be enough to help them pull off a performance in their own home town, designed to get them match fit for the later stages of the competition?